Benadryl (diphenhydramine) is an over-the-counter (OTC) antihistamine commonly used to treat allergies that is also sometimes used as a sleep aid for insomnia. Benadryl is only intended for the ...

If you give your dog liquid Benadryl, avoid the adult formula because it often contains alcohol, which is toxic for dogs. Ask your veterinarian about your dog’s allergy symptoms before using ...